Siena Ariel Callander, 26, of Sydney, pleaded guilty to entering enclosed lands, interfering with the conduct of business, and hindering police twice when she appeared in Goulburn Local Court on May 22.

In court, Callander's solicitor said her client was not a member of any group affiliated with the raid and wasn't aware of the action that would take place at Southern Meats.

But Magistrate Geraldine Beattie said Callander had to have known the intention of the group when she attended a meeting the night before to find out the raid time and place.

Police facts tendered in court said that at 2am on April 8, nine people, part of animal activist group The Dominion, entered Southern Meats after the gate was opened.

They avoided detection until 4am, when it was discovered they had chained themselves to a conveyor belt used during the slaughter process.

Police asked the accused, Callander, to remove herself from the conveyor, but she refused. Police Rescue was called to cut the chains, which were under PVC piping.

Police asked Callander to remove her feet from under the conveyor but she refused again. Police had to climb under the conveyor to remove her feet and carry her from the belt to an area to remove the chains and piping.

While under the belt, police saw the keys to the locks and chains. Callander's solicitor argued her client had nothing to do with the keys on the floor.

She also said Callander was born in the US, but came to Australia to live aged seven. The solicitor said her client worked full-time in childcare and had spent many years volunteering in animal welfare and rescue.

"She stopped consuming animal products as a teenager," the solicitor said.

"She has held long-term volunteer positions at various animal shelters and attended many protests, but her commitment to animal welfare and protesting has been entirely lawful until now.

"She got caught up in the moment and didn't understand the seriousness of her actions."

The solicitor said Callander had sustained bruises to her wrists because of Police Rescue removing the restraints.

Police prosecutor sergeant Fiona Krawczyk objected to this, saying police had asked Callander to leave and warned her that she would receive additional charges if she didn't. Sgt Krawczyk also said there was a need for deterrence from future raids.

Magistrate Geraldine Beattie agreed and said police had no choice but to remove the restraints.

"Police and Police Rescue were called to remove the chains, but police had to go further and crawl on the floor and carry you off the conveyor because you wouldn't cooperate," Magistrate Beattie said.

"It was dangerous for police to go under the conveyor."

Magistrate Beattie said that while everyone had a right to protest and have a voice on issues, there was a difference between making a point legally and illegally.

"If people are prepared to break the law, then they have to understand there are significant consequences that go with it," Magistrate Beattie said.

"I see your commitment to the welfare of animals ... but you took it too far."

She convicted Callander and placed her on a nine-month community corrections order, fined her $2850 and ordered her to pay $621 to Southern Meats and $52 to NSW Police.

Two more of the nine activists were also charged and sentenced at Goulburn Local Court on May 22.

Vanessa Burton, 28, from Sydney pleaded guilty to charges of entering inclosed lands and interfering with the conduct of business and hindering police twice.

She was placed on a 18 month community corrections order, fined $2100 and ordered to pay $621.88 to Southern Meats and $52.31 to NSW Police.

Charlize Reynierse, 21, from Singleton pleaded guilty to charges of entering inclosed lands and interfering with the conduct of business and hindering police.

She was placed on a 12 month community corrections order, fined $600 and ordered to pay $621.88 to Southern Meats and $52.31 to NSW Police.